[python] Remove untranslated warnings and duplicated _report_icase_hint
[python] Remove untranslated warnings and duplicated _report_icase_hint

When trying to install package using invalid case (like dnf install ACPI),
"Maybe you meant: acpi" message was printed twice:

$ dnf install ACPI
  * Maybe you meant: acpi
No match for argument: ACPI
  * Maybe you meant: acpi
Error: Unable to find a match

rpm-software-management/libdnf,rpm-software-management/libdnf,rpm-software-management/libhif,rpm-software-management/libhif,Conan-Kudo/libhif,Conan-Kudo/libhif,hughsie/libhif,Conan-Kudo/libhif,rpm-software-management/libhif,Conan-Kudo/libhif,hughsie/libhif,rpm-software-management/libdnf,rpm-software-management/libhif,hughsie/libhif,hughsie/libhif,rpm-software-management/libdnf